Year	current US$
1990	1731.2095094382037
1991	2235.5410886252153
1992	2459.0206846825326
1993	2497.1305593612706
1994	2874.83163555069
1995	3686.8451458027807
1996	4147.465501454831
1997	4123.145676667248
1998	4518.108226301741
1999	4398.072174267322
2000	4501.479961212338
2001	4991.244357995107
2002	5207.129304206997
2003	5701.6388630191395
2004	6681.309750873879
2005	8021.5478903738785
2006	9035.532758109272
2007	11254.314087534942
2008	13995.781159811531
2009	11525.9007370991
2010	12504.250185609268
2011	13776.388362432715
2012	13010.75558684246
2013	13558.341131422065
2014	14181.948681735234
2015	12560.051419682035
2016	12378.81281061112
2017	13815.501164767038
2018	15504.507506269178
2019	15700.0135796738
2020	15816.819050318963
2021	18050.27788629956
2022	18732.49772731982
2023	22112.861574705992